enneagon, hendecagon, dodecagon, triskaidecagon, tetrakaidecagon,and pentekaidecagon, froming by combining the Greek names for thecorrsponding numbers with "gon", meaning "angle", which is a shortened form of the Greek word "gonu", meaning "knee". It's a nicefact that the Greek, Latin, French, German, and English words forknee, namely gonu genu genu Knee knee , are allessentially the same. However the pronunciation has changed, the initial hard g of the Greek and Latin forms becoming soft g in French, and hard k in German and English, and the n being no longer pronounced in English.